16. _______ medicine works in a human body is a question _______ not everyone can understand fully.
They are similar___appearance, but differ_character
___early for his date, Mark spent time reading the newspaper
Large quantities of information___since then as to how the program has worked.
Helen has got___it takes to be a great tennis player.In other words, she has the potential to become world famous.
Eat-up Campaign has become___ hot topic, calling for people to take_action against waste